1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_PID_NS_H
3#define _LINUX_PID_NS_H
4
5#include <linux/sched.h>
6#include <linux/bug.h>
7#include <linux/mm.h>
8#include <linux/workqueue.h>
9#include <linux/threads.h>
10#include <linux/nsproxy.h>
11#include <linux/kref.h>
12#include <linux/ns_common.h>
13#include <linux/idr.h>
14
15
16struct fs_pin;
17
18enum { /* definitions for pid_namespace's hide_pid field */
19 HIDEPID_OFF = 0,
20 HIDEPID_NO_ACCESS = 1,
21 HIDEPID_INVISIBLE = 2,
22};
23
24struct pid_namespace {
25 struct kref kref;
26 struct idr idr;
27 struct rcu_head rcu;
28 unsigned int pid_allocated;
29 struct task_struct *child_reaper;
30 struct kmem_cache *pid_cachep;
31 unsigned int level;
32 struct pid_namespace *parent;
33#ifdef CONFIG_PROC_FS
34 struct vfsmount *proc_mnt;
35 struct dentry *proc_self;
36 struct dentry *proc_thread_self;
37#endif
38#ifdef CONFIG_BSD_PROCESS_ACCT
39 struct fs_pin *bacct;
40#endif
41 struct user_namespace *user_ns;
42 struct ucounts *ucounts;
43 struct work_struct proc_work;
44 kgid_t pid_gid;
45 int hide_pid;
46 int reboot; /* group exit code if this pidns was rebooted */
47 struct ns_common ns;
48} __randomize_layout;
49
50extern struct pid_namespace init_pid_ns;
51
52#define PIDNS_ADDING (1U << 31)
53
54#ifdef CONFIG_PID_NS
55static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
56{
57 if (ns != &init_pid_ns)
58 kref_get(&ns->kref);
59 return ns;
60}
61
62extern struct pid_namespace *copy_pid_ns(unsigned long flags,
63 struct user_namespace *user_ns, struct pid_namespace *ns);
64extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
65extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
66extern void put_pid_ns(struct pid_namespace *ns);
67
68#else /* !CONFIG_PID_NS */
69#include <linux/err.h>
70
71static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
72{
73 return ns;
74}
75
76static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
77 struct user_namespace *user_ns, struct pid_namespace *ns)
78{
79 if (flags & CLONE_NEWPID)
80 ns = ERR_PTR(-EINVAL);
81 return ns;
82}
83
84static inline void put_pid_ns(struct pid_namespace *ns)
85{
86}
87
88static inline void zap_pid_ns_processes(struct pid_namespace *ns)
89{
90 BUG();
91}
92
93static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
94{
95 return 0;
96}
97#endif /* CONFIG_PID_NS */
98
99extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
100void pidhash_init(void);
101void pid_idr_init(void);
102
103#endif /* _LINUX_PID_NS_H */
104